- any substance that retards deterioration by oxidation, esp of fats, oils, foods, petroleum products, or rubber
- a substance, such as vitamin C, vitamin E, or beta carotene, that counteracts the damaging effects of oxidation in a living organism
WordReference Random House Unabridged Dictionary of American English © 2026
an•ti•ox•i•dant
(an′tē ok′si dənt, an′tī-),USA pronunciation n.
adj.
- Chemistryany substance that inhibits oxidation, as a substance that inhibits oxidative deterioration of gasoline, rubbers, plastics, soaps, etc.
- Biochemistryan enzyme or other organic substance, as vitamin E or beta carotene, that is capable of counteracting the damaging effects of oxidation in animal tissues.
adj.
- Chemistryof or pertaining to an antioxidant.
- anti- + oxidant (oxid(ize) + -ant) 1925–30
Collins Concise English Dictionary © HarperCollins Publishers::
antioxidant /ˌæntɪˈɒksɪdənt/ n
'antioxidant' also found in these entries (note: many are not synonyms or translations):
curcumin
- naphthol
- ORAC
- resveratrol
- silymarin
- BHA
- BHT
- coenzyme Q 10
- EDTA
- erythorbic acid
- inhibitor
- vitamin E